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SAVVA Technical Tip 57  Overheating problems
We are heading into a hot time of the year and the enemy of old cars will again be raising its ugly head  overheating.
Recently I was reminded of this when a friend purchased a comparatively modern car, a lovely 1967 MGB GT. All went well excepting it was getting a tad warm. Against better advice and judgment he went the usual route of fitting a new thermostat, back flushing, adding copious amounts of expensive additives etc. etc., all to no avail. After trying everything possible he reverted to what he should have done in the first place and that was to have the radiator professionally cleaned or the core replaced. He eventually replaced the core and his problem was solved.
We have to keep in mind that although cars like this MGB are 45 years old - how many liters of suspect water has been added to the radiator over these years. How clean was this water or the containers used?
I recall as a youngster when the family went on out of town trips it was common to see relatively modern cars (of the day) on the side of the road cooking. I think the problem in those days was that vehicles were made for countries with cooler climates and shipped to places like the RSA without much thought for our hotter weather.
So where are we today? Some 40 to 80 years later we expect these same cars, which were often marginal when new to handle our hot weather - well its not going to happen. Our suggestion is to start with the radiator. Dont waste money feeding additives to it  rather give it to a specialist radiator company, let them look at the number of cores and the general condition of them and if necessary replace or increase them.
If the car was manufactured before pressurised systems became standard consider pressurising it to say 3 to 4 pounds. Its comparatively easy for a modern water cap and receptacle to be fitted to an early radiator whilst they are recoring or refurbishing it. In many cars an overflow bottle can be fitted which upgrades the system to a closed one as fitted to modern cars. An ideal overflow bottle/tank is the brass one originally fitted to early Minis and 1100s.
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